Engine pump jack



March 23, u wvo. BECHMAN `EJICTIIIE. PUMP JACK Filed O01.. 2l, 1955 2 Sheets-Sheet 1 MHA W. O. BECHMAN ENGINE-PUMP JACK March 23, 1 937.

Filed 001'.. 21, 1935 2 Sheets-Sher. 2

Patented Mar. 23, 1937 ENGINE PUMP JACK `William O. Bechman, Chieago,.lll., assignor to International Harvester tion of New Jersey Company, a corpora- Application' october 21, 1935, serial No. 45,976

4 Claims.

This invention' relates to a pump jack attach- .ment for engines, and more particularly to an :enclosed gear drive from the engine to the pump jack.

One object of the invention is to provide a pump jack and gear drive for the same which are readily attached and detached to allow for use .of the engine with or without the pump jack unit. i Another object is to provide a pump jack housing thatvmay be attached to the enginev and driven from the pulley shaft of the engine without interference with the operation of the engine pulley.

Another object is to provide a pump jack housing construction that may be secured to a pump casing or the like to afford a solid and rigid unit between the engine and the pump casing.

. Still another object is to provide a pump jack housing` constructionwith a cover plate that may bereadily removed without disturbing the connection between the housing and the engine.

Still another object is to provide a pump jack housing construction that will afford an'oil-tight sealv between the pulley and the `housing cover plate and the pulley shaft.

Other objects willbe -apparent from the following description and drawings, in which:

i vFigure 1 is a side elevational View embodying the invention and showing the pump jack in place on the engine; and,

Figure 2 is a plan View of the same partly in section, the sectional portion beingviewed substantially along the line 2-2`on Figure 1, and looking in the direction of the arrows.

' The reference character I0 denotes an internal combustion engine of the stationary or utility type. The drawings illustrate only that portion of the engine which is necessary to describe and disclose the invention.

The crank-case II and the cylinder block I2 are cast in one piece, as is customary in the construction Vof one cylinder engines, and have formed integral therewith supporting lugs or ears I3, which with securing bolts I4 secure the rengine Il) to a pair of base rails i5 and I5. These rails are preferably formed of channel steel and are provided with rounded ends and lifting hand grips I6. 1

A crank-shaft I'l, indicated in dotted lines in Figure l, extends transverselyV across the crankcase I I and carries at one end the usual y wheel I8. Above the Vcrank-shaft |'I and parallel to the crank-shaft is the pulley shaft I9, which is formed as an extension of the cam shaft 20. The cam shaft 23 is gear driven from the crankshaft, as is customary in the construction of internal combustion engines,

Secured by bolts 2|' to the pulley side of the engine over the opening through which extends the camshaft 2li and the pulley shaft extension (Cl. rfi-.11)

I9, is the pump jack gear housing 2|. This housing extends rearwardly from the engine and is provided at one side with an integral bearing housing 22, which is provided with a bracket 23 and U-bolts 24. The bracket 23 and U-bolts 24 provide a rigid support for attachment to a pump casing 25 indicated in both figures in dotted lines, thus affording a solid and compact unit between the engine It, through the housing 2|, and the pump casing 25, reducing vibration there-between to a minimum.

'The housing 2| at the pulley side of the engine, is supported by an integral leg 26 secured by a bolt 21 to the turned-over edge of the channel steel base rail I5 near the lifting hand grip I E.

A support 28, preferably formed as a stiff strap forging, is bolted to the engine I at its rearward end, and extends rearwardly to the bearing Ahousing 22 of the gear housing 2|, where itis secured to theunderside of the bracket 23 by albolt 29. The support 28.. is further bent downward, as at 30, toward a cross support 3|, which is bolted at its opposite ends to the base rails l and I5. lThe bent extension 30 of the support 28 is secured to this cross support 3| by the bolt `32.

This construction provides for support at both sides of the rearward end of the pump jack housing 2| and for pactness of the entire unit.

It will be apparent from the foregoing description that the pump jack housing may be easily and readily detached from the engine to allow theengine to be usedfor other purposes.

Extending through the housing 2| and carried at one end in the bearing housing 22 is a transverse shaft 33, at opposite ends of which and outside of the housings 2| and 22, are mounted crank-wheels 34. These crank-wheels are identical inf construction and are held fast to each end of the shaft 33 by split hubs 35, clamp bolts 33, and driving keys 31. A cover plate 38 covers the housing 2| and forms an additional bearing for the shaft 33, as at 39. Within the housing 2| and enclosedv by the cover plate 38, the shaft 33 has keyed and clamped thereto a gear 40.

Intermediate the shaft 33 and the pulley shaft I9 and within the housing 2| and enclosed by the cover plate, is a short transverse stub shaft 4|. Mounted for. rotation on the stub shaft 4| is a pinion 42 and an integral gear 43. The pinion 42 meshes with and engages the gear 40 on the shaft 33.

Mounted on the pulley shaft I9 adjacent and outside of the engine, and enclosed by the gear housing 2| and cover plate 38, is a driving pinion 44, which extends substantially the length of the pulley shaft I9 and which is keyed thereto by a driving key 45. The pinion 44 is adapted to mesh with and drive the gear 43 on the shaft continuous rigidity and com- 4I, which also carries integrally with the gear 43 the pinion 42, which in turn meshes with and drives the gear 4U on the shaft 33. A continuous, enclosed gear drive is thereby provided between the engine l0 and the crank-wheels 34.

'I'he pinion 44, beyond its toothed portion, is provided with a series of annular grooves 45 for a purpose to appear later. Adjacent'the outer end of the pinion 44 and. mounted over the outer end of the pulley shaft I 9, is the customary drive pulley 46. This pulley 46 is provided with a hub portion 41 and annular recesses 48 and 48' on either side of the hub portion 41. Bolts 49, extending through the hub portion 41 and into the pinion 44, secure the pulleys 46 to the pinion and establish Aa driving connection therewith.

The portion of the cover plate 38 of the pump jack housing 2| surrounding and enclosing the pulley shaft I9 and driving pinion 44 is formed as a substantially annular hub extension 59, which encircles the outer end 0f the pinion 44 about the annular grooves 45, and substantially abuts the hub portion 41 of the pulley 46. An annular groove 5| within the hub extension 50 of the cover plate 38 cooperates with the outermost annular groove 45 on the pinion 44 to form an annular recess for retaining the circular lubrication seal 52. The other grooves 45 are provided as oil carrying grooves, as is well known to those skilled in the art.

v From this description it will be apparent that the pulley 46 is still available for use while the pump jack housing and unit are in place and in operation. It will be further apparent that the pulley 46 may be removed from the pinion 44 by the removal of the bolts 49 without disturbing the housing 2| or the cover plate 38. A small cap (not shown) may be secured over the opening left by the removal of the pulley in the hub extensionA 50 of the cover plate 38, to maintain the lubrication seal and to facilitate operation of theV engine and pump jack without the pulley.

`In order to effect a connection between the pump jack and the pump, the crank-wheels 34 are provided with holes 53 arranged on radial spokes of the wheels. These holes 53 are spaced for adjustment and are adapted to receive pitman pins54. Pitmans 55 for driving the pump are secured at one end by these pitman pins 53 to the crank-wheels 34 and'at the opposite ends, to the' pump, not shown, as is well understood by those skilled in the art.

It will now be apparent that an enclosed gear drive is provided between the pulley shaft I9 and the crank-wheel shaft 33. The shaft 20, which is in effect the cam shaft of the engine, is gear driven by the crank-shaft I1 through the customary gears, not shown.

It is often necessary or desirable to operate the engine Without the pump jack attached. To accomplish this, the bolts 49 are removed and the pulley 46 detached from the pinion 44, and the pinion removed from the shaft I9. Next, the U-bolts 24 are removed from the pump casing 25, and the bolt 29 removed from the support 28 and the bracket 23. The bolts 2|' are removed from the housing 2| and the engine I0, and the housing 2| together with the cover plate 38, the crank-wheels 34 and shaft 33, the enclosed gears 40 and 43, and the pinion 42, may be removed as a unit.

It is the intention to cover all modifications of the above described invention which do not in material respects depart from the spirit and scope of the appended claims.

What is claimed is:

1. In a combined pump jack and internal combustion engine, the combination of a shaft extending from and driven by said engine, a pinion mounted on said shaft for rotation therewith outside of the engine, a pulley mounted concentric with the shaft and secured to the pinion for rotation therewith, a gear housing mounted on one side of the engine concentric with the shaft to enclose the pinion and to form a lubrication seal with the pulley, said gear housing extending rearwardly beyond the engine, a support between the engine and the housing at its rearward end, a gear mounted for rotation on a second shaft within the gear housing and adapted to be driven by the pinion, a second pinion formed integral with said gear, a third shaft extending through the gear housing, crank-wheels at opposite ends of said third shaft outside of the gear housing, a second gear mounted within the gear housing on said third shaft for rotation therewith and adapted to be driven by the second pinion within the gear housing to form a continuous gear drive from the engine to the crank-Wheels.

2. In a combined pump jack and internal combustion engine, the combination of a shaft extending from and driven by said engine, a pinion mounted on said shaft for rotation therewith, a gear housing mounted at one side of and extending beyond the engine, an annular portion formed on said housing and surrounding the pinion and Ythe shaft, a bearing housing on the gear housing extending transversely at one side of the engine, a support between the bearing housing and the engine, a shaft carried in said bearing housing and gear housing, and drive gearing within the gear housing for driving said shaft from the pinion.

3. In a combined pump jack and internal combustion engine, the combination of a shaft extending from and driven by said engine, a pinion mounted on said shaft for rotation therewith, a pulley mounted on said shaft for rotation therewith, a gear housing mounted at one side of and extending beyond the engine, said gear housing having an annular portion thereon surrounding the pinion and the shaft and forming with the pulley a lubrication seal therebetween, a crank shaft mounted in the gear housing in the portion beyond the engine, crank-wheels mounted for rotation with the crank-shaft, and drive gearing within the housing for driving said crank-wheels from the pinion.

4. In a combined pump jack and internal combustion engine, the combination of a shaft extending from and driven by the housing, a pinion mounted on said shaft for rotation therewith, said pinion being formed with an annular reduced end portion, a pulley mounted on said shaft and secured to the pinion for rotation therewith, said pulley having a flat faced hub portion, a gear housing mounted on the engine between the engine and the pulley, an annular portion on said gear housing surrounding the pinion adjacent the pulley, said annular portion being provided with an internal annular recess surrounding the reduced end portion of the pinion, and a lubrication seal between said annular recess and the reduced end portion of the pinion and cooperating with the flat hub of the pulley.

WILLIAM O. BECHMAN. 

